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Alunogen: Al2(SO4)3·17(H2O) Jarosite: KFe+++3(SO4)2(OH)6
Comments: Colorless to white, tabular crystals alunogen on reddish jarosite. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Alunogen: Al2(SO4)3·17(H2O) Metavoltine: K4Na4(Fe++,Zn)Fe+++6(SO4)12O2·20(H2O)
Comments: Yellow metavoltine with white alunogen. Location: Carola Mine, Freital, near Dresden, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Amarantite: Fe+++(SO4)(OH)·3(H2O)
Comments: Amber-like, long, prismatic, bright red amarantite crystals. Location: Chuquicamata, Antofagasta, Chile. Scale: Crystal size 3 cm. © Tom Loomis / Dakota Matrix
Amarillite: NaFe+++(SO4)2·6(H2O)
Comments: Yellowish white, powdery crystals of amarillite crystals. Location: Grotta de Faraglione, Porte de Levante, Island de Vulcano, Italy. Scale: Specimen Size 15 x10 x 7 mm. © Sergey Vasiliev / Systematic Mineralogy
Amber: [C,H,O]
Comments: Rectangular specimen of dark, transparent amber with a large spider entombed inside. Location: Bitterfeld, Saxony, Germany. Scale: 14x10x10 mm. © John Betts - Fine Minerals
Amblygonite: (Li,Na)Al(PO4)(F,OH)
Comments: Grayish, massive amblygonite from the type locality. Location: Chursdorf, Penig, Chemnitz, Saxony, Germany. Scale: Specimen size 35 mm. © Thomas Witzke / Abraxas-Verlag
Ameghinite: NaB3O3(OH)4
Comments: Aggregate of white, elongated crystals of ameghinite. Location: Tincalayu Mine, Salta, Argentina. Scale: Specimen Size 1.5 x 1.5 x 1.5 cm. © Tom Loomis / Dakota Matrix
Amesite: Mg2Al(SiAl)O5(OH)4
Comments: White, massive amesite between quartz. Location: Missoula, Missoula County, Montana, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Amesite: Mg2Al(SiAl)O5(OH)4 Titanite: CaTiSiO5
Comments: Green titanite (sphene) crystals on purple chromamesite (clinochlore?). Location: Saranovskaya Deposit, Middle Ural Mountains, Russia. Scale: Picture size 7 cm. © Dave Barthelmy
Amicite: K2Na2Al4Si4O16·5(H2O)
Comments: White amicite crystals in massive amicite. Location: Howenegg, Hegau, Baden-Wurttemberg, Germany. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Aminoffite: Ca3Be2Si3O10(OH)2
Comments: Clear, pyramidal aminoffite crystal. Location: Langban, Varmland, Sweden. Scale: Size Not Given. © Lou Perloff / Photo Atlas of Minerals